Seismic response of single-column bent on pile: evidence of beneficial role of pile and soil inelasticity |
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| Authors: | Nikos Gerolymos V Drosos G Gazetas |
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| Institution: | (1) National Technical University, Athens, Greece |
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| Abstract: | While seismic codes do not allow plastic deformation of piles, the Kobe earthquake has shown that limited structural yielding
and cracking of piles may not be always detrimental. As a first attempt to investigate the consequences of pile yielding in
the response of a pile-column supported bridge structure, this paper explores the soil–pile-bridge pier interaction to seismic
loading, with emphasis on structural nonlinearity. The pile–soil interaction is modeled through distributed nonlinear Winkler-type
springs and dashpots. Numerical analysis is performed with a constitutive model (Gerolymos and Gazetas 2005a, Soils Found
45(3):147–159, Gerolymos and Gazetas 2005b, Soils Found 45(4):119–132, Gerolymos and Gazetas 2006a, Soil Dyn Earthq Eng 26(5):363–376)
materialized in the OpenSees finite element code (Mazzoni et al. 2005, OpenSees command language manual, p 375) which can
simulate: the nonlinear behaviour of both pile and soil; the possible separation and gapping between pile and soil; radiation
damping; loss of stiffness and strength in pile and soil. The model is applied to the analysis of pile-column supported bridge
structures, focusing on the influence of soil compliance, intensity of seismic excitation, pile diameter, above-ground height
of the pile, and above or below ground development of plastic hinge, on key performance measures of the pier as is: the displacement
(global) and curvature (local) ductility demands and the maximum drift ratio. It is shown that kinematic expressions for performance
measure parameters may lead to erroneous results when soil-structure interaction is considered. |
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| Keywords: | Dynamic soil-structure interaction Soil and pile inelasticity Seismic performance measures Extended pile shaft-supported bridge |
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